Best Time to Fly JAX to SJU: On-Time Stats by Hour & Airline
Jacksonville International → Luis Munoz Marin International
Data through July 2026 · Last updated October 18, 2026
261 flights were scheduled from Jacksonville (JAX) to San Juan (SJU) in the last 12 months, and 71.9% of those that flew arrived on time, 5.7 points below the US average of 77.6%.
Among 2 airlines, Frontier Airlines led with 73.2% on time and JetBlue was last with 70.4%.
Over 24 months, Friday was the most reliable day (77% on time) and December the worst month (53%).
The cancellation rate was 3.1% (US average 1.8%).
JAX to SJU on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Frontier Airlines | 73.2% | 115 min | 4.2% | 144 |
| JetBlue | 70.4% | 73 min | 1.7% | 117 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly JAX to SJU
On-time arrival % by scheduled departure hour (local time), 408 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 9am–10am | Limited data | 9 | |
| 10am–11am | 64.5% | 3.1% | 32 |
| 11am–12pm | 86.7% | 1.9% | 107 |
| 12pm–1pm | Limited data | 5 | |
| 2pm–3pm | Limited data | 11 | |
| 3pm–4pm | Limited data | 17 | |
| 4pm–5pm | 66.7% | 2.5% | 40 |
| 5pm–6pm | 81.2% | 0.0% | 32 |
| 6pm–7pm | Limited data | 27 | |
| 7pm–8pm | Limited data | 25 | |
| 8pm–9pm | 47.5% | 2.4% | 41 |
| 9pm–10pm | 61.8% | 8.1% | 37 |
| 10pm–11pm | Limited data | 25 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on JAX to SJU
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 12 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 30 | ||
| Summer peak (Jun 15 - Aug 15) | 71.4% | -2.2 pts | 2.0% | 150 |
| All other days | 73.7% | — | 3.2% | 216 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).